From: <Eugen.Hristev@microchip.com>
To: robh+dt@kernel.org, mark.rutland@arm.com,
Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com,
Ludovic.Desroches@microchip.com, wsa@the-dreams.de,
linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Eugen.Hristev@microchip.com
Subject: [PATCH 5/5] i2c: at91: add support for analog filtering
Date: Thu, 20 Jun 2019 07:16:19 +0000 [thread overview]
Message-ID: <1561014676-22446-5-git-send-email-eugen.hristev@microchip.com> (raw)
In-Reply-To: <1561014676-22446-1-git-send-email-eugen.hristev@microchip.com>
From: Eugen Hristev <eugen.hristev@microchip.com>
Add new platform data support for analog filtering for i2c.
The sama5d2 and sam9x60 support this feature.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
drivers/i2c/busses/i2c-at91-core.c | 9 +++++++++
drivers/i2c/busses/i2c-at91-master.c | 15 +++++++++++----
drivers/i2c/busses/i2c-at91.h | 3 +++
3 files changed, 23 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/busses/i2c-at91-core.c b/drivers/i2c/busses/i2c-at91-core.c
index 3bbe37c..d2840ba 100644
--- a/drivers/i2c/busses/i2c-at91-core.c
+++ b/drivers/i2c/busses/i2c-at91-core.c
@@ -70,6 +70,7 @@ static struct at91_twi_pdata at91rm9200_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata at91sam9261_config = {
@@ -80,6 +81,7 @@ static struct at91_twi_pdata at91sam9261_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata at91sam9260_config = {
@@ -90,6 +92,7 @@ static struct at91_twi_pdata at91sam9260_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata at91sam9g20_config = {
@@ -100,6 +103,7 @@ static struct at91_twi_pdata at91sam9g20_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata at91sam9g10_config = {
@@ -110,6 +114,7 @@ static struct at91_twi_pdata at91sam9g10_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static const struct platform_device_id at91_twi_devtypes[] = {
@@ -142,6 +147,7 @@ static struct at91_twi_pdata at91sam9x5_config = {
.has_hold_field = false,
.has_dig_filtr = false,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata sama5d4_config = {
@@ -152,6 +158,7 @@ static struct at91_twi_pdata sama5d4_config = {
.has_hold_field = true,
.has_dig_filtr = true,
.has_adv_dig_filtr = false,
+ .has_ana_filtr = false,
};
static struct at91_twi_pdata sama5d2_config = {
@@ -162,6 +169,7 @@ static struct at91_twi_pdata sama5d2_config = {
.has_hold_field = true,
.has_dig_filtr = true,
.has_adv_dig_filtr = true,
+ .has_ana_filtr = true,
};
static struct at91_twi_pdata sam9x60_config = {
@@ -172,6 +180,7 @@ static struct at91_twi_pdata sam9x60_config = {
.has_hold_field = true,
.has_dig_filtr = true,
.has_adv_dig_filtr = true,
+ .has_ana_filtr = true,
};
static const struct of_device_id atmel_twi_dt_ids[] = {
diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c
index b9e601e..6b591ac 100644
--- a/drivers/i2c/busses/i2c-at91-master.c
+++ b/drivers/i2c/busses/i2c-at91-master.c
@@ -32,6 +32,7 @@
void at91_init_twi_bus_master(struct at91_twi_dev *dev)
{
struct at91_twi_pdata *pdata = dev->pdata;
+ u32 filtr = 0;
/* FIFO should be enabled immediately after the software reset */
if (dev->fifo_size)
@@ -42,13 +43,19 @@ void at91_init_twi_bus_master(struct at91_twi_dev *dev)
/* enable digital filter */
if (pdata->has_dig_filtr)
- at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT);
+ filtr |= AT91_TWI_FILTR_FILT;
/* enable advanced digital filter */
if (pdata->has_adv_dig_filtr)
- at91_twi_write(dev, AT91_TWI_FILTR, AT91_TWI_FILTR_FILT |
- (AT91_TWI_FILTR_THRES(7) &
- AT91_TWI_FILTR_THRES_MASK));
+ filtr |= AT91_TWI_FILTR_FILT |
+ (AT91_TWI_FILTR_THRES(7) & AT91_TWI_FILTR_THRES_MASK);
+
+ /* enable analog filter */
+ if (pdata->has_ana_filtr)
+ filtr |= AT91_TWI_FILTR_PADFEN | AT91_TWI_FILTR_PADFCFG;
+
+ if (filtr)
+ at91_twi_write(dev, AT91_TWI_FILTR, filtr);
}
/*
diff --git a/drivers/i2c/busses/i2c-at91.h b/drivers/i2c/busses/i2c-at91.h
index ccf18ba..f009799 100644
--- a/drivers/i2c/busses/i2c-at91.h
+++ b/drivers/i2c/busses/i2c-at91.h
@@ -86,6 +86,8 @@
#define AT91_TWI_FILTR 0x0044
#define AT91_TWI_FILTR_FILT BIT(0)
+#define AT91_TWI_FILTR_PADFEN BIT(1)
+#define AT91_TWI_FILTR_PADFCFG BIT(2)
#define AT91_TWI_FILTR_THRES(v) ((v) << 8)
#define AT91_TWI_FILTR_THRES_MASK GENMASK(10, 8)
@@ -115,6 +117,7 @@ struct at91_twi_pdata {
bool has_hold_field;
bool has_dig_filtr;
bool has_adv_dig_filtr;
+ bool has_ana_filtr;
struct at_dma_slave dma_slave;
};
--
2.7.4
prev parent reply other threads:[~2019-06-20 7:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 7:16 [PATCH 1/5] dt-bindings: i2c: at91: add new compatible Eugen.Hristev
2019-06-20 7:16 ` [PATCH 2/5] i2c: at91: add new platform support for sam9x60 Eugen.Hristev
2019-06-20 7:16 ` [PATCH 3/5] i2c: at91: add support for digital filtering Eugen.Hristev
2019-06-20 8:27 ` Alexandre Belloni
2019-06-20 7:16 ` [PATCH 4/5] i2c: at91: add support for advanced " Eugen.Hristev
2019-06-20 7:16 ` Eugen.Hristev [this message]
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